Baking-powder.



; llTED ress- PATET OFF CE.)

JOHN A. JUST, uh SYRACUSE, NEN YORK, ASSIGNOR OF ONE-HALF TO D. BURRELL 1&7 COMPANY, OF LITTLEFALLS, NEW YORK, A FIRM.

BAKING POWDER.

SPECIFICATION forming part of Letters Patent No. 692,452, dated February 4, 190 2.

A -lamented June 10, 1901. Serial No. 63,996. (N specimens-f To all whom it may concern.-

Be it known that 1, JOHN A. JUST, a citizen of the United States, and a resident of Syracuse, in the county of Onondaga and State of New York, have invented a new and useful Improvement in BakingPowders," of which the following is a specification. I,

The object of this invention is to utilize phosphoric acid as an acid ingredient in baklug-powders. l have found that this acid can be satisfactorily employed for this purpose by,

combining it with casein in such proportion that a product is formed which is stable and non-hygroscopic and which is so acid in its action that it liberates a large percentage of gas from a gas-producing salt, such as bicarbonate of soda.

In practicing my invention I proceed as follows: The phosphoric acid which is employed may be produced in any Well-known mannerfor instance, by decomposing tricalcic or monocalcic phosphate by sulfuric acid-or it may be commercial, phosphoric acid. The casein is produced in any suitable mannerfor instance, by precipitating the curd from skim-milk by a suitable acid, separating the purities.

curd from the whey, and washing out the im- A'caseinate, such as a compound of casein and an alkali or alkaline earth, may also be employed. I incorporate sufficient phosphoric acid with casein or a caseinate to insure sufficient acidity in the final compound. A satisfactory proportion is from twenty three to twenty-five parts, by weight, of phosphoric acid to from seventy-seven to seventy- ..five parts of casein, or approximately twentyfour parts, by weight, of phosphoric acid and seventy-six parts of casein or caseinate.

. consistency. The remainder of the necessary amount of casein or caseinate is then added and the ingredients are thoroughly mixedand united, preferably by grinding the mixture to a uniform moist mush-like consistency. The composition is then dried inacurrent of hot air or by other suitable means in such a way'that the product is not discolored or in- The I ssf produces a dry and stable compound. The

latter contains a much larger proportion of phosphoric acid than would be contained in acid phosphate of casein. This compound, which may be designated as a hyperphosphate of casein, yields with its equivalent of bicarbonate of soda about seventeen per cent.

of gas and forms a very desirable acid ingredient for baking-powder. When mixed with water, this compound swells up and dissolves slowly. r

The following is an illustration of a satisfactory baking-powder mixture containing this improved acid ingredient: One hundred and ninety-six parts, by weight, of phosphoric .7

acid are combined with six hundred and sixteen parts of casein; producing eight hundred and twelve parts of the acid compound. About eight hundred parts of this compound are mixed with fonrhundred and ninetyparts I do not wish to claim in this application the herein-described compound of casein and phosphoric acid or the method of making the same, because these inventions are claimed in a separate application for patent filed by me on the 30th day of September, 1901, Serial No. 77,137, as a subdivision of this application.

I. claim as my invention- 2 v ceases 1. Theherein-described highly-acidcomposition of matter consisting of phosphoric acid and casein, containing phosphoric acid largely in excess of the amount which is contained in acid phosphate of casein and being dry, non-hygro$copic and soluble in water.

2. Ihe herein-described composition of matter consisting approximately of twenty-four parts, by weight, of phosphoric acid and seventy-six parts of casein.

3. A baking-powder composed of a carbonate, a filler and the herein-described composition of casein and phosphoric acid, contain- I ing phosphoric acid largely in excess of the amount which is contained in acid phosphate of casein and being dry, non-hygroscopic, and soluble in Water.

4. A baking-powder composed of a carbonate, a filler and the herein-described composition of casein and phosphoric acid, composed approximately of twenty-four parts, by Weight, of phosphoric acid and seventy-six parts of casein.

Witness myhand this 7th day of June, 1901.

v JOHN A. JUST.

Witnesses:

DANIEL H. STRAOHAN, THOS. J. MOLLOY. 

